What is Tethered Jailbroken??

Discussion in 'Jailbreaks and iOS Hacks' started by lllll, Oct 26, 2009.

  1. lllll macrumors regular

    Joined:
    Oct 23, 2009
    #1
    Hi, I'm 2 days new to macrumors.com

    What is Tethered Jailbroken? Can someone explain it like it was from Wiki?

    What I need.. Where should I start.. etc.

    and can you restore your stuff if all things should go wrong.
     
  2. The General macrumors 601

    Joined:
    Jul 7, 2006
    #2
    iphones have a bootrom called iboot that checks the system during boot and if it finds problems (like jailbreaks) it refuses to boot. when we pwn our phones, we modify the bootrom to ignore that stuff and just boot the device.

    the newer bootrom is immune to the "24kpwn" exploit that we used on the previous one to modify it, so we can not permanently modify it. to get around this, they have found another exploit that works temporarily. over usb.

    so every time you boot your phone, you have to do the same exploit with your device to get it to boot. so when they say "tethered" what they mean is that your device can't boot without being connected (or tethered) to your computer.

    after it's booted, you can disconnect it. if you try to reboot your device, it will not be able to start without you connecting it to your computer and running whatever program boots these devices.
     
  3. bytethese macrumors 68030

    bytethese

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    Cranford, NJ
    #3
  4. dhlizard macrumors G4

    dhlizard

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    Mar 16, 2009
    Location:
    The Jailbreak Community
    #4
    So if your battery runs out, or you need to reboot because of an error, or a Cydia app install, you have to have the computer and USB cable at hand in order to get the phone running again. Not a very viable option.
     
  5. Tokiopop macrumors 68000

    Tokiopop

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    Dec 6, 2008
    Location:
    West Yorkshire, UK
    #5
    If it were that simple, why does Apple not release a software update to change the bootrom, rather than release a new hardware revision with a new bootrom resistant to current exploits?

    I don't know much on how jailbreaking works, but if it's ROM I'm pretty sure it can't be changed.

    On topic, bottom line is if you've got a tethered Jailbreak and turn it off, the Jailbreak is gone.
     
  6. dhlizard macrumors G4

    dhlizard

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    #6
    I am far from an expert, but when I used to use PPC's, we could build a custom ROM (deleting the crap we didn't want to use) so as to speed up the PPC and allow more free storage space.

    That said, I don't know if anything similar is possible on the iPhone. Aren't we sort of doing this with Pwnage Tool when we mod the firmware to remove the baseband updates ??
     
  7. bytethese macrumors 68030

    bytethese

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    #7
    It's not a software update, but Apple DID update the bootrom. :)
    http://www.macrumors.com/2009/10/14...sed-iphone-3gs-models-to-hinder-jailbreaking/
     
  8. Tokiopop macrumors 68000

    Tokiopop

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    Dec 6, 2008
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    West Yorkshire, UK
    #8
  9. bytethese macrumors 68030

    bytethese

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    Jun 20, 2007
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    #9
    Yikes, I re-read. My apologies. I should finish my morning coffee before posting. :)
     
  10. lllll thread starter macrumors regular

    Joined:
    Oct 23, 2009
    #10
    so I should get an iphone or Touch that doesn't have the latest bootrom? how do I know which bootrom is the older version?
     
  11. Tokiopop macrumors 68000

    Tokiopop

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    Dec 6, 2008
    Location:
    West Yorkshire, UK
    #11
    Before you buy, you don't.
     
  12. darngooddesign macrumors G3

    Joined:
    Jul 4, 2007
    Location:
    Atlanta, GA
    #12
    Do you want a phone or an iPod?

    The tethering you are hearing about just means that if there is no wifi around you can use your phone as a modem.
     
  13. Night Spring macrumors G5

    Night Spring

    Joined:
    Jul 17, 2008
    #13
    Actually, there're two senses of "tethering" being used -- one is to use iphone as a modem, the other is to connect iphone or ipod touch to a computer through USB to boot it up. In this thread we are talking about the second meaning.
     
  14. ViViDboarder macrumors 68040

    ViViDboarder

    Joined:
    Jun 25, 2008
    Location:
    USA
    #14
    ROM cannot be changed... easily... Look at what's going on with Modding the Wii right now. There is a way to write into empty places in the ROM yes, but flashing the entire ROM, like Nintendo has tried to do, has caused some bad issues with Modded and Unmodded users.

    This is why Apple doesn't just release software updates to close the Boot ROM exploits.
     
  15. bradenwh macrumors 6502

    Joined:
    Apr 12, 2008
    #15
    ROM can be changed. Not easily, but it can be changed. Read-only memory means it was only meant to be read from, not modified or written to. Not to say that it can't.
     

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